HDDS-1710. Fix checkstyle errors

Signed-off-by: Anu Engineer <aengineer@apache.org>

hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/HddsUtils.java

@@ -480,13 +480,13 @@ public final class HddsUtils {
   }
 
   /**
-   * Initialize hadoop metrics systen for Ozone servers.
-   *  @param configuration OzoneConfiguration to use.
-   * @param serverName    The logical name of the server components. (eg.
+   * Initialize hadoop metrics system for Ozone servers.
+   * @param configuration OzoneConfiguration to use.
+   * @param serverName    The logical name of the server components.
    * @return
    */
-  public static MetricsSystem initializeMetrics(OzoneConfiguration configuration,
-      String serverName) {
+  public static MetricsSystem initializeMetrics(
+      OzoneConfiguration configuration, String serverName) {
     MetricsSystem metricsSystem = DefaultMetricsSystem.initialize(serverName);
     JvmMetrics.create(serverName,
         configuration.get(DFSConfigKeys.DFS_METRICS_SESSION_ID_KEY),

hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/HddsDatanodeService.java

@@ -36,7 +36,6 @@ import org.apache.hadoop.hdds.security.x509.certificate.client.DNCertificateClie
 import org.apache.hadoop.hdds.security.x509.certificates.utils.CertificateSignRequest;
 import org.apache.hadoop.hdds.tracing.TracingUtil;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
 import org.apache.hadoop.ozone.container.common.helpers.ContainerUtils;
 import org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine;
 import org.apache.hadoop.security.SecurityUtil;

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/server/StorageContainerManager.java

@@ -81,13 +81,10 @@ import org.apache.hadoop.hdds.security.x509.certificate.authority.DefaultCAServe
 import org.apache.hadoop.hdds.server.ServiceRuntimeInfoImpl;
 import org.apache.hadoop.hdds.server.events.EventPublisher;
 import org.apache.hadoop.hdds.server.events.EventQueue;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.metrics2.MetricsSystem;
-import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
-import org.apache.hadoop.metrics2.source.JvmMetrics;
 import org.apache.hadoop.metrics2.util.MBeans;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
 import org.apache.hadoop.ozone.OzoneSecurityUtil;

hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/OzoneManager.java

@@ -65,7 +65,6 @@ import org.apache.hadoop.hdds.security.x509.certificate.utils.CertificateCodec;
 import org.apache.hadoop.hdds.security.x509.certificates.utils.CertificateSignRequest;
 import org.apache.hadoop.hdds.server.ServiceRuntimeInfoImpl;
 import org.apache.hadoop.hdds.tracing.TracingUtil;
-import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.hdfs.DFSUtil;
 import org.apache.hadoop.hdfs.util.PersistentLongFile;
 import org.apache.hadoop.io.Text;
@@ -74,7 +73,6 @@ import org.apache.hadoop.ipc.Client;
 import org.apache.hadoop.ipc.ProtobufRpcEngine;
 import org.apache.hadoop.ipc.RPC;
 import org.apache.hadoop.ipc.Server;
-import org.apache.hadoop.metrics2.source.JvmMetrics;
 import org.apache.hadoop.ozone.OzoneAcl;
 import org.apache.hadoop.ozone.OzoneConfigKeys;
 import org.apache.hadoop.ozone.OzoneIllegalArgumentException;